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Texas Instruments UA748CDR
- Part No.:
- UA748CDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA748CDR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
UA748CDR from Texas Instruments is a general-purpose operational amplifier with external frequency compensation capability, ±15 V supply rating, 0.5 V/µs slew rate, and input offset voltage ≤6 mV at 25°C - used in precision analog signal conditioning, active filter design, and industrial sensor interface circuits.
For engineers reviewing the UA748CDR datasheet, UA748CDR pinout, UA748CDR application, or UA748CDR equivalent, this page delivers verified electrical specs, SOIC-8 package details, offset-null configuration guidance, and validated alternatives for legacy design support and obsolescence mitigation.
Technical Context
The UA748CDR implements an uncompensated DC-coupled op-amp architecture enabling user-defined bandwidth/slew-rate trade-offs via external capacitor (e.g., 30 pF for unity-gain stability). It features dual offset-null terminals (N1/N2), short-circuit protected output, and rail-to-rail common-mode input range of ±12 V at ±15 V supplies.
Its high open-loop gain (20–200 V/mV), low input bias current (80–500 nA), and wide operating temperature range (0°C to 70°C) make it suitable for stable DC amplification and moderate-speed AC signal processing where internal compensation would limit flexibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±15 V nominal; supports ±18 V max - enables operation in standard dual-rail industrial power domains. |
| Input Offset Voltage | ≤6 mV at 25°C - sets baseline DC error in precision gain stages without trimming. |
| Slew Rate | 0.5 V/µs at unity gain - limits large-signal bandwidth to ~80 kHz for 10-Vpp output swing. |
| Common-Mode Input Range | ±12 V at ±15 V supply - allows direct interfacing with sensors referenced to system ground or rails. |
| Output Short-Circuit Duration | Unlimited - permits robust fault tolerance in transient-loaded feedback networks. |
| Power Dissipation | 464 mW at TA = 70°C (SOIC-D package) - defines thermal derating margin for PCB layout. |
| Operating Temperature | 0°C to 70°C - qualifies for commercial-grade instrumentation and control systems. |
Pinout & Package
UA748CDR is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, D package per TI's packaging nomenclature, with gull-wing leads, tape-and-reel delivery (suffix R), and RoHS-compliant finish (Pb-Free per TI eco-plan).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N1 / Offset Null | Connects to one end of external potentiometer for input offset voltage adjustment. |
| 2 | Inverting Input (IN−) | Primary negative feedback node; accepts signal or reference for inverting configurations. |
| 3 | Non-Inverting Input (IN+) | Positive input terminal; used in non-inverting amplifiers and comparators with hysteresis. |
| 4 | VCC− | Negative supply rail connection; must be decoupled near device for stability. |
| 5 | N2 / Offset Null | Connects to other end of same potentiometer as Pin 1 for balanced nulling. |
| 6 | Output (OUT) | Amplified single-ended output; capable of ±10 V swing into 2 kΩ load. |
| 7 | VCC+ | Positive supply rail connection; requires local 0.1 µF ceramic decoupling. |
| 8 | COMP / Compensation | External compensation node; connects to 30 pF capacitor for unity-gain stability. |
Key Features
| Feature | Design Value |
|---|---|
| External Compensation | Enables bandwidth optimization: 30-pF cap yields unity-gain stability; larger gains allow reduced capacitance for higher slew rate. |
| Offset-Voltage Null Capability | Two dedicated pins (N1/N2) support <1-mV residual offset after calibration using 10-kΩ potentiometer. |
| Short-Circuit Protection | Output survives indefinite short to either rail or ground - eliminates need for external current-limiting resistors. |
| Wide Common-Mode Range | ±12 V input range at ±15 V supply allows direct connection to transducers operating near supply rails. |
| No Latch-Up | CMOS-free bipolar process prevents destructive latch-up during overvoltage transients on inputs or supplies. |
Applications
| Industrial Sensor Signal Conditioning | Active Low-Pass Filter Design |
|---|---|
|
Use Scenario: Amplifying low-level thermocouple or strain gauge outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with adjustable gain and offset nulling to reject common-mode noise and thermal drift. Use Value: Enables sub-mV resolution with ≤6 mV initial offset and stable operation across 0°C–70°C ambient range. |
Use Scenario: Implementing 2nd-order Sallen-Key low-pass filters in data acquisition front-ends. IC Role / Device Role / Timing Role: Unity-gain stable op-amp configured as buffer and integrator stage with externally compensated pole placement. Use Value: 30-pF compensation allows precise cutoff frequency tuning up to ~1 MHz while maintaining phase margin >45°. |
| Legacy Test Equipment Amplifier Stage | DC Power Supply Error Amplifier |
|
Use Scenario: Replacing obsolete uA709 in vintage oscilloscope vertical deflection amplifiers. IC Role / Device Role / Timing Role: Drop-in compatible general-purpose op-amp with identical pinout and improved slew rate (0.5 V/µs vs. 0.3 V/µs). Use Value: Maintains original circuit functionality while improving transient response and reducing overshoot in step-driven displays. |
Use Scenario: Regulating output voltage in linear bench power supplies with remote sensing. IC Role / Device Role / Timing Role: High-gain error amplifier comparing sensed output to reference, driving pass transistor base/emitter. Use Value: Large differential input range (±30 V) accommodates sensing offsets; short-circuit protection prevents latch-up during load faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar general-purpose operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM358DR | Single-supply rated (3–32 V), lower slew rate (0.3 V/µs), no offset-null pins, internal compensation. | Better suited for battery-powered systems; lacks fine DC offset control needed in precision sensor paths. | Select LM358DR only when single-rail operation and cost outweigh need for offset trimming and external compensation. |
| TL072CDR | JFET-input (50 pA IIB), higher slew rate (13 V/µs), wider GBW (3 MHz), no offset-null pins. | Superior for audio and high-frequency AC coupling; unsuitable where DC precision and nullability are mandatory. | Choose TL072CDR for AC-coupled signal chains requiring low noise and speed; retain UA748CDR for DC-stable, trimmable designs. |
Compared with LM358DR and TL072CDR, the UA748CDR uniquely supports user-configurable compensation and factory-trimmable offset - critical for legacy industrial systems where exact uA709 compatibility, DC accuracy, and thermal stability across 0°C–70°C are required.
Availability
UA748CDR is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy test equipment repair, analog filter design, and DC power supply regulation requiring stable component supply under long-lifecycle support constraints.
Supply support for UA748CDR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog ICs, embedded processors, and high-reliability components for industrial, automotive, and aerospace markets.
The UA748CDR belongs to TI's legacy general-purpose op-amp product line, designed for robustness, pin compatibility with uA709, and adaptability in analog signal conditioning where external compensation and offset trimming are essential.
FAQ
What is the maximum supply voltage for UA748CDR?
The UA748CDR supports a maximum supply voltage of ±18 V across VCC+ and VCC− terminals. This rating applies under continuous operation at free-air temperatures up to 70°C and ensures reliable performance in dual-rail industrial power environments without exceeding absolute maximum limits.
Does UA748CDR include internal frequency compensation?
No, the UA748CDR does not include internal frequency compensation. It requires an external capacitor (typically 30 pF between Pin 8 and Pin 4) for unity-gain stability. This design allows engineers to optimize bandwidth and slew rate based on closed-loop gain requirements - a key distinction from internally compensated op-amps like the UA741.
How is input offset voltage adjusted on UA748CDR?
Input offset voltage on the UA748CDR is adjusted using a 10-kΩ potentiometer connected between Pin 1 (N1) and Pin 5 (N2), with the wiper tied to VCC− (Pin 4). This configuration allows trimming residual offset to under 1 mV, supporting precision DC amplification in sensor signal chains where baseline accuracy is critical.
Is UA748CDR pin-compatible with uA709?
Yes, the UA748CDR uses the same 8-pin SOIC pinout as the uA709, including identical assignments for IN+, IN−, OUT, VCC+, VCC−, and offset-null terminals. This pin compatibility enables direct replacement in legacy designs originally specified with uA709, preserving PCB layout and interconnect integrity.
What is the operating temperature range of UA748CDR?
The UA748CDR is characterized for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with its "C" suffix designation and qualifies the device for use in non-extreme industrial control panels, laboratory instruments, and fixed-location embedded systems where environmental conditions remain within standard room-temperature envelopes.
UA748CDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- 80 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 1.7mA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 36 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA748CDR FAQ
1.How can I place an order for UA748CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for UA748CDR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UA748CDR reliable?
The price and inventory of UA748CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA748CDR is usually 5 days.
3.What payment methods are accepted for UA748CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA748CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA748CDR?
UA748CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA748CDR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UA748CDR?
For technical support, including UA748CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA748CDR requirements.
6.How does Aetrix verify that UA748CDR is sourced from the original manufacturer or authorized distributors?
All UA748CDR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UA748CDR meets industry standards.
7.What is the process for return or replacement of UA748CDR?
All UA748CDR units undergo pre-shipment inspection (PSI). If there is an issue with UA748CDR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UA748CDR part is unused and in its original packaging.
Return procedure for UA748CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UA748CDR Tags
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